I'm having non-stop issues w/ DynamicWebResource and trying to load
images
external to my .ear deployment now that I've moved to 1.3. First off,
I'm
hoping someone can suggest an easier way to do it because what I have now
is
code that someone was nice enough to give me, here on the Wicket mailing
list. However, I don't entirely understand how it works and while it
worked
for 2 years in Wicket 1.2, it is now causing me problem after problem in
Wicket 1.3.x - for whatever reason.
First what I've got is a class called ImageResource which extends
DynamicWebResource:
/*****************************************************/
public class ImageResource extends DynamicWebResource
{
private ImageService imgSrv;
public ImageResource()
{
super();
imgSrv = new ImageServiceEngine();
}
public String getImage(String image)
{
String retImg = null;
try
{
retImg = imgSrv.getImage(image).toString();
}
catch (IOException exp)
{
LogProxy.saveEntry(exp);
}
return retImg;
}
protected ResourceState getResourceState()
{
ImageResourceState state = null;
try
{
ValueMap params = getParameters();
byte[] data = null;
String imageId = params.getString("file");
//Date lastModified = getImageLastMod(imageId);
state = new ImageResourceState(Time.valueOf(new
Date()));
state.setContentType("image/jpeg");
//SECURITY PRECAUTION - DO NOT ALLOW ANYTHING BUT
IMAGES!
if
(imageId.contains(PropertyProxy.getExternalImagesRoot()) ||
imageId.contains(PropertyProxy.getExternalImagesAltRoot()))
{
data = imgSrv.getImage(imageId);
}
else
{
//change image to "not found" warning
image
data =
imgSrv.getImage(PropertyProxy.getImageNotFound());
//TODO: send email to notify of
inappropriate access
}
state.setData(data);
}
catch (FileNotFoundException exp)
{
LogProxy.saveEntry(exp);
}
catch (IOException exp)
{
LogProxy.saveEntry(exp);
}
catch (NullPointerException exp)
{
LogProxy.saveEntry(exp);
}
return state;
}
/**
*
* @author vjenks
*
*/
protected class ImageResourceState extends ResourceState
{
private String contentType;
private byte[] data;
private Time lastModified;
ImageResourceState(Time lastModified)
{
super();
this.lastModified = lastModified;
}
public String getContentType()
{
return contentType;
}
void setContentType(String contentType)
{
this.contentType = contentType;
}
public byte[] getData()
{
return data;
}
void setData(byte[] data)
{
this.data = data;
}
public int getLength()
{
if (data != null)
return data.length;
else
return 0;
}
public Time lastModifiedTime()
{
return lastModified;
}
}
}
/*****************************************************/
You can see that it uses a class called ImageServiceEngine:
/*****************************************************/
public class ImageServiceEngine implements ImageService, Serializable
{
private int thumbnailSize;
public ImageServiceEngine()
{
super();
}
public int getThumbnailSize()
{
return this.thumbnailSize;
}
public void setThumbnailSize(int size)
{
this.thumbnailSize = size;
}
public byte[] getImage(String image) throws IOException
{
// Open the file, then read it in.
ByteArrayOutputStream outStream = new
ByteArrayOutputStream();
InputStream inStream = new FileInputStream(new
File(image));
copy(inStream, outStream);
inStream.close();
outStream.close();
return outStream.toByteArray();
}
public Date getLastModifyTime(String image)
{
File f = new File(image);
return new Date(f.lastModified());
}
/* Spring Injected */
private File imageDir;
public void setImageDir(String dirName)
{
imageDir = new File(dirName);
}
public byte[] getThumbnail(String image) throws IOException
{
// Open the file, then read it in.
ByteArrayOutputStream outStream = new
ByteArrayOutputStream();
InputStream inStream = new FileInputStream(new
File(image));
copy(inStream, outStream);
inStream.close();
outStream.close();
return outStream.toByteArray();
}
/**
* Copies data from src into dst.
*/
private void copy(InputStream source, OutputStream destination)
throws IOException
{
try
{
// Transfer bytes from source to destination
byte[] buf = new byte[1024];
int len;
while ((len = source.read(buf)) > 0)
{
destination.write(buf, 0, len);
}
source.close();
destination.close();
}
catch (IOException ioe)
{
throw ioe;
}
}
private File createImageFile(String image)
{
File file = new File(imageDir, image);
return file;
}
/** @see ImageService#save(ImageEntry) */
public void save(String image, InputStream imageStream)
throws IOException
{
// Read in the image data.
ByteArrayOutputStream baos = new ByteArrayOutputStream();
copy(imageStream, baos);
baos.close();
byte[] imageData = baos.toByteArray();
baos = null;
// Create a unique name for the file in the image
directory and
// write the image data into it.
File newFile = createImageFile(image);
OutputStream outStream = new FileOutputStream(newFile);
outStream.write(imageData);
outStream.close();
}
}
/*****************************************************/
ImageResource is setup in init() in the App class like so:
/*****************************************************/
public void init()
{
//create external images resource
getSharedResources().add("imageResource", new ImageResource());
}
/*****************************************************/
Now, if there's a nicer, cleaner, more simple way of loading external
images, I'd really appreciate some suggestions.
As for what is now broken, it seems to have something to do w/ the fact
that
the Wicket Filter is looking at "/*" to find the application because if I
use this URL to view an image via my "imageResource" like so:
http://localhost/MyApp/resources/wicket.Application/imageResource?file=C:\\Images\\assets\\images\\newsletter\\test_bkg.jpg
...I get a 404 not found. This worked fine when my URL had an alias in
Wicket 1.2, i.e. "/products" instead of the "/*" that is used now. If I
use
"/products" in the URL above, as I would have prior to 1.3 (since I have
it
listed as a mountable URL in the app class) - it throws an exception
saying
"java.lang.IllegalStateException: URL fragment has unmatched key/value
pair:
resources/wicket.Application/imageResource"
So, I need help in both areas....one, making this easier, if possible.
And,
most importantly - being able to restore production and be able to view
external images ASAP.
Thanks very much in advance!
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